Dynaglide is sold by the foot. 

Teufelberger's Dynaglide Endura 12 throw line is made of 100% Dyneema for low stretch and light-weight. This pre-stretched, tension set 12-strand has a slick smooth finish and glides easily overcrotches for better performance with lighter throw weights.

This is a favorite for pulling up your bow or back and or pulling down your rappel line from the tree

Details

Very high strengthVery low stretchCoating improves abrasion resistanceSlick finish glides effortlessly over barkTensile:  1,000 lbs.Diameter:  1.8mm